As I said, I am not Catholic. You write as though you are. So you certainly know more about this than I.
I am Catholic, which is why I can tell you with authority, the Catholic Church has no gray area on abortion. Abortion is murder according to all Catholic teaching. Life begins at conception, period.
Being Catholic means you live and practice the Catholic faith, it does not mean you pick and choose the parts that suit you.
There is no such thing as a Pro-Choice Catholic, if you claim to hold that position you are not a practicing Catholic. Doesn’t matter if your butt is in that pew 7 days a week, or how much money you put in the plate, or how many rosaries you pray, etc etc etc.
You can consider yourself Catholic, but you are not. There is no ambiguity on this topic, life begins at conception, period. There is no concept of “Pro-Choice” to a Catholic, only “Pro-Murder”.
You cannot claim to be Catholic and Pro-Choice, to be one makes it impossible to be the other. Now, that doesn’t mean there aren’t people out there claiming to be Catholic who are so ignorant of their faith that they think its not an impossible stand, but it is. There is no confusion in the Catholic Faith on this issue.